<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
					
					var arr1 = new Array();
					console.log(arr1.length);
					arr1[0] = "张三";
					arr1[1] = "李四";
					arr1[2] = "王五";
					console.log(arr1.length);
					
					var arr2 = new Array(5);
					console.log(arr2.length);
					console.log(arr2[0]);// undefined
					
					var arr3 = new Array(10,20,30);
					console.log(arr3.length);
					console.log(arr3[0]);
					
					var arr4 = [10,20,30,40];
					console.log(arr4.length);
					console.log(arr4[0]);
					
					var arr5 = [
						{id:1,name:"张三",age:18},
						{id:2,name:"张三",age:18},
						{id:3,name:"张三",age:18},
					]
					
					var stu = {
						name:"张三",
						friends : ["李四","王五","赵六"]
					}
					
					
					
					
					
				</script>
	</body>
</html>
